Removal, checking and installation valves (VW Beetle)

Removal

Remove the cylinder head (see section "Removal and installation cylinder heads").

Attention! Old valves must be installed in their original locations. Mark all valves before disassembling. After prolonged engine operation, a burr may form on the contact surface of the crackers with the valve stem. It must be removed using a velvet file so that the burr does not leave scratches when the valve passes through the guide sleeve.

Press down on the valve spring plates and remove the crackers. In workshops, a clamping device is used for this purpose (see photo) or a valve spring compressor (see the "Tools" chapter). The valve spring retainer can also be pressed down using two strong screwdrivers. Then (by any method of pressing) insert a tab into the combustion chamber so that the valve does not fall through when pressed. At the same time, the assistant should take out the crackers.

Remove the spring plate, valve spring and seal. Examination

Clean the disassembled valves with a wire brush.

Check the valves for carbon deposits on the seats, runout and signs of wear on the stems, and damage to the grooves for the crackers.

Caution! The valve stem must not be machined or straightened. Damaged valves must be replaced.

If only the end surface of the rod is broken, then only the valve cuff can be replaced. Cuffs are available at VW/Audi service stations (catalog number - 113 109 621).

The cuff is placed on the valve stem before installing the rocker arm and does not require additional locking.

Installation

Before installing the valves in this case, the following work must be carried out: check the valves and their guide bushings in the cylinder head, grind the valve seats in the cylinder head, grind and grind the valves, and check their seats for leaks.

Apply a layer of M0S2-based paste to the valve stems and install the valves in their original locations as marked.

Install new seals on the valve stems.

Install the valve springs and spring retainers.